The MSI B550M PRO-VDH pushes 128GB across two DDR4 slots in a micro-ATX board

MSI’s B550M PRO-VDH fits 128GB of DDR4 into a compact micro-ATX board using just two slots. That means 64GB per slot using dual-channel configuration — a serious amount of memory for a board at this size and price point. The catch is that you’ll need high-density 64GB sticks to hit the ceiling, which are pricier than more common 32GB modules.